Version 79.0.301.2 (Official build) dev (64-bit) is crashing on me. Usually happens while trying to render a page. I can't always replicate but sometimes it will crash at the same spot. This is the first version that I have experienced crashes.
it's a known issue, Canary had it and it got resolved. now it got passed on to the Dev channel (obviously without a fix) so you have to wait for the next update to fix it for you.
there are other threads about it when it was available on Canary
